arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2003.10636cs.GT
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多购机制的菜单复杂性与收益连续性

Menu-size Complexity and Revenue Continuity of Buy-many Mechanisms

Shuchi Chawla, Yifeng Teng, Christos Tzamos

摘要:

研究了垄断者将$n$异质商品出售给单一购买者的多商品机制设计问题。我们关注的是多买机制,这是一种在实践中经常使用的自然机制。buy-many属性允许买方多次与机制交互,而不是像更常见的buy-one机制那样只交互一次。这强加了额外的激励约束,从而限制了卖方可以使用的机制的空间。在本文中,我们探讨了购买一个和购买多个机制的两个重要属性:收入的连续性和菜单大小的复杂性之间的质的差异。我们的第一个主要结果是,当购买者的价值函数的扰动乘以一个因子$1\pmε$,购买多机制获得的最优收益只改变了一个因子$1 \pm \textrm{poly}(n,ε)$。相比之下,对于买一机制,在这样的扰动之后,所得的最优机制的收益可以任意改变。我们的第二个主要结果表明,在任意分布的任意估值,有限的菜单大小足以实现一个$(1-ε)$ -近似的最优多买机制。我们给紧的上限和下限的菜单项的数量作为$n$和$ε$的函数。另一方面,这样的结果不成立买一个机制,即使是两个项目和一个买家与单位需求或添加剂估值,菜单大小的复杂性近似最优机制是无界的。

英文摘要:

We study the multi-item mechanism design problem where a monopolist sells $n$ heterogeneous items to a single buyer. We focus on buy-many mechanisms, a natural class of mechanisms frequently used in practice. The buy-many property allows the buyer to interact with the mechanism multiple times instead of once as in the more commonly studied buy-one mechanisms. This imposes additional incentive constraints and thus restricts the space of mechanisms that the seller can use. In this paper, we explore the qualitative differences between buy-one and buy-many mechanisms focusing on two important properties: revenue continuity and menu-size complexity. Our first main result is that when the value function of the buyer is perturbed multiplicatively by a factor of $1\pmε$, the optimal revenue obtained by buy-many mechanisms only changes by a factor of $1 \pm \textrm{poly}(n,ε)$. In contrast, for buy-one mechanisms, the revenue of the resulting optimal mechanism after such a perturbation can change arbitrarily. Our second main result shows that under any distribution of arbitrary valuations, finite menu size suffices to achieve a $(1-ε)$-approximation to the optimal buy-many mechanism. We give tight upper and lower bounds on the number of menu entries as a function of $n$ and $ε$. On the other hand, such a result fails to hold for buy-one mechanisms as even for two items and a buyer with either unit-demand or additive valuations, the menu-size complexity of approximately optimal mechanisms is unbounded.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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